Obligatory MS2PNP beginner issues
 

So I purchased a MS2PNP and installed it on my 1999 yesterday. After setting ignition timing I still noticed some unsee issues. When getting back into my car this morning it seemed to have re-flashed itself. Now I know I burned the ecu before disconnecting and decided to reload my tune. That fixed the issue. Next I noticed my car running extremely lean at idle 10-12 afr. I retuned it to stay at 14.6 while the car was at operating temperature. I began to street tune it after this. While driving the car hesitated at the first tip of throttle. I believed this was part of my acceleration enrichment tune so while I stopped to readjust it the car stalled. I then restarted it but every time I went to change the tune the car kept stalling. I then ate some dinner and when I fired the car it had the same issue this morning! It did not want to start and remained at extremely low fluctuating idle/stalling. I am now here confused and regretting my purchase. The car is completely besides a different intake and no precat in the headers. PLZ HELP!!!!

Yeah that's not how it works. Based on that statement I would highly recommend you reinstall the factory ecu and spend about 50 hours reading/researching before putting the megasquirt back in.

If you're not willing to do that you'll need to post logs of the issue so we can help.

To clarify, the richer it is the lower the AFR number. That's the opposite of your statement.

All the info you need is in this forum. Read the stickies. The msextra forum is excellent as well.

If you have a specific problem google it. If you aren't sure what a setting does research it until you understand it completely. Then make changes.

We live in a magically time where nearly everything you could ever want to know is available for free. The most useful skill you'll ever learn is how to use a search engine.

We can't help without a log.

Need the current log and tune. Yes i know you uploaded it, but give us what you got.
What procedure did you do to set timing?
Are you running the MAF still or not?
is your engine bay completely stock?
what wideband are you running? Did you wire and calibrate the wideband properly? did you calibrate your thermistor tables and TPS for your year model?
where did you buy your MS, and where did you source a base tune? Is the firmware the latest version?
what is the end goal for your megasquirt equipped car?

all of these questions should have went through your head already, if you have truly read our forums and spent time here. but I also dont blame you, its a daunting task to sort through all the flame and to MS your car.

update
 

After some more fiddling and switching to the wideband. This is my current tune and now data log. The car is not reading the afr correcting I believe as the gauge on Tuner studio switches from 16.1 to 12.1 randomly. The car again is completely stock with CAI and catless headers. I am currently tuning this NA to get experience before turbo. The wideband I believe is calibrated and I know tps and AIT (GM) is set up correctly. The firmware is the latest version.

Yep fix your wideband. Can't do any tuning without it. Did you go here and tell TS what wideband you're using?

https://cimg6.ibsrv.net/gimg/www.mia...823f5e0076.png

Your wideband display and tunerstudio are both showing 7.5 afr?

Well that's an obvious problem isn't it?

I'm not convinced you're misfiring. AFR would go super lean in the event of a misfire. An inductive timing light doesn't work well for what you're using it for.

Fix your wideband settings so you can actually progress with tuning.

For the love of christ keep your shit in one thread. Multiple threads revolving around the same botched MS install will not get your shit running more quickly.

2. Do you have fuel shut off turned on? It runs rich because of accel enrichment needs better tuned for negative TPSdot, then probably goes into fuel shut off (which is good).

Sorry it's been a while since I've been in TunerStudio, looks like the decel isn't handled as negative TPSdot, but there's a %multiplier for decel. Read this: https://www.diyautotune.com/support/...el-enrichment/

Fuel shut off is called over run fuel or something like that.

Have you at least read through this for setting up your MSpnp2?

http://www.msextra.com/doc/pdf/Megas...ing_Up-3.4.pdf

There are 2 settings for fuel cut that could be what you're describing.

1. Overrun Fuel Cut
2. Decel Fuel Amount - Under AE settings